<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./js/vue.js"></script>
    <style>
        #app{
            border: 2px solid black;
            padding: 10px;
            margin-bottom: 400px;
        }
        .child{
            margin: 20px;
            padding: 10px;
            background-color: #cccccc;
        }
    </style>
</head>
<body>
    <div id="app">
        <h3>父组件范围</h3>
        <child-one></child-one>
        <child-two></child-two>
    </div>

    <template id="ChildOne">
        <div class="child">
            <h3>子组件one</h3>
            <p>info:{{ info }}</p>
            <input type="text" v-model="info">
            <hr>
            <p>msg:{{ msg }}</p>
            <input type="text" v-model="msg">
        </div>
    </template>
    <template id="ChildTwo">
        <div class="child">
            <h3>子组件two</h3>
            <p>info:{{ info }}</p>
            <input type="text" v-model="info">
            <hr>
            <p>msg:{{ msg }}</p>
            <input type="text" v-model="msg">
        </div>
    </template>
</body>
<script>
     // 当实例中（给实例的this.$state.msg = nv;）赋值时，observable也会修改state中的值
    var state = Vue.observable({
        msg:"字符串",
        num:100,
        flag:true,
        user:{
            name:"tom"
        },
        arr:[1,2,3]
    });
    // console.log(obj,state);

//虽然每个实例多会有这个对象，但是可以在控制台通过Vue.prototype.$state = null 修改，不安全
    // Vue.prototype.$state = Vue.observable({
    //     msg:"字符串",
    //     num:100,
    //     flag:true,
    //     user:{
    //         name:"tom"
    //     },
    //     arr:[1,2,3]
    // });

    Vue.mixin({
        computed: {
            msg:{
                get(){
                    return state.msg;
                    // return this.$state.msg;
                },
                set(nv){
                    state.msg = nv;
                    // this.$state.msg = nv;
                }
            }
        },
        created() {
            console.log(this);
            //这样写就修改不了
            this.$state = state;
        },
    });


    Vue.component("ChildOne",{
        template:"#ChildOne",
        data(){
            return {
                info:state.msg
                // info:this.$state.msg
            }
        },
    });
    Vue.component("ChildTwo",{
        template:"#ChildTwo",
        data(){
            return {
                info:state.msg
                // info:this.$state.msg
            }
        },
    });
    var vm = new Vue({
        el:"#app"
    });
</script>
</html>